飛翔体の高速衝突下における鉄筋補強モルタル柱の損傷に及ぼす繊維補強効果

抄録

The objective of this study is to obtain data that contributes to the development of a damage-reducing method for reinforced concrete columns under severe accidents involving shock phenomena. Experimental investigations were conducted to evaluate the effects of long/short fiber reinforcement on the damage of reinforced mortar (RM) columns subjected to high-velocity projectile impact. The following two types of RM column specimens were supplied for high-velocity impact tests: (i) RM columns strengthened with two-directional aramid fiber sheets (AFRP sheets) lining; and (ii) RM columns of which the mortar was replaced with polyvinyl-alcohol fiber reinforced cementitous composite (PVA-FRCC). The results showed that the lining strengthening with two-directional AFRP sheets remarkably reduces the exfoliation of mortar even under the condition that an impact velocity is almost 1 000 m/s. PVA-FRCC also possessed good damage-reducing performance under an impact velocity of almost 600 m/s, but the exfoliation occurred under that of almost 1 000 m/s.